Abstract
Effects of screw design and number of screw rotations on fracture mechanisms of fiber-reinforced polypropylene (FRPP) are studied by means of acoustic emission (AE) technique. The fiber length, the fiber orientation angle and the AE characteristics are explained in terms of the apparent shearing stresses on the various number of rotations for B and C screws with shallow groove and deep one. It is clear from specimen molded by a screw with shallow groove that the maximum load is high, the maximum cumulative AE event count and the maximum total AE energy are low on the smaller fiber orientation angle, but the load is low and the AE characteristics are high on the larger orientation angle. It is found from the AE frequency analysis that the fiber breakings dominate the damage modes of specimens molded by B screw, but the fiber debonding and the breaking appear on the specimens molded by C screw.
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